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Abstract

The dependence of the photoinduced second-order nonlinearity of germanosilicate glasses on the GeO2-SiO2 composition was investigated using photoinduced second-harmonic generation (SHG). The photoinduced SHG was encoded by coherent superposition of the 800-nm fundamental and the 400-nm second-harmonic light of a femtosecond laser. Experimental results showed that the photoinduced second-order optical nonlinearity increased with increasing concentrations of GeO2 in the glasses, and the concentration dependence was mainly due to the dependence of the photoinduced internal dc electric field of the glass on the GeO2-SiO2 composition.

Fig. 2. (a) Growth in time (squares) and decay (circles) of the SHG signal of the germanosilicate glass sample prepared by femtosecond laser pulses at wavelengths of 800 and 400 nm. (b), temporal correlation dependence of the SHG signals of the glass sample between the two seed beams ω and 2ω.

Fig. 4. (a) pump power dependence of the THG signal of the germanosilicate glass with 10-GeO2-90-SiO2 (mol. %) composition. The THG intensity shows cubic pump-power dependence. (b), measurements for χ(3)
of germanosilicate glasses for different GeO2-SiO2 composition. The laser power was 100 mW.